rs387906225

Positions:

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000035.4(ALDOB):c.360_363del(p.Asn120LysfsTer32) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000725 in 1,613,942 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000072 ( 0 hom. )

Consequence

ALDOB
NM_000035.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:16O:1

Conservation

PhyloP100: 2.76

Variant links:

Genes affected

ALDOB (HGNC:417): (aldolase, fructose-bisphosphate B) Fructose-1,6-bisphosphate aldolase (EC 4.1.2.13) is a tetrameric glycolytic enzyme that catalyzes the reversible conversion of fructose-1,6-bisphosphate to glyceraldehyde 3-phosphate and dihydroxyacetone phosphate. Vertebrates have 3 aldolase isozymes which are distinguished by their electrophoretic and catalytic properties. Differences indicate that aldolases A, B, and C are distinct proteins, the products of a family of related 'housekeeping' genes exhibiting developmentally regulated expression of the different isozymes. The developing embryo produces aldolase A, which is produced in even greater amounts in adult muscle where it can be as much as 5% of total cellular protein. In adult liver, kidney and intestine, aldolase A expression is repressed and aldolase B is produced. In brain and other nervous tissue, aldolase A and C are expressed about equally. There is a high degree of homology between aldolase A and C. Defects in ALDOB cause hereditary fructose intolerance. [provided by RefSeq, Dec 2008]

ALDOB links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 9-101428484-CTTTG-C is Pathogenic according to our data. Variant chr9-101428484-CTTTG-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 188861.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-101428484-CTTTG-C is described in Lovd as [Pathogenic]. Variant chr9-101428484-CTTTG-C is described in Lovd as [Pathogenic]. Variant chr9-101428484-CTTTG-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALDOB	NM_000035.4 linkuse as main transcript	c.360_363del	p.Asn120LysfsTer32	frameshift_variant	4/9	ENST00000647789.2	NP_000026.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALDOB	ENST00000647789.2 linkuse as main transcript	c.360_363del	p.Asn120LysfsTer32	frameshift_variant	4/9		NM_000035.4	ENSP00000497767	P1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251364

Hom.:

AF XY:

0.0000663

AC XY:

AN XY:

135838

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000163

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000792

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000718

AC:

105

AN:

1461672

Hom.:

AF XY:

0.0000784

AC XY:

AN XY:

727158

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000854

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000788

AC:

AN:

152270

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74452

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.000473

Bravo

AF:

0.0000945

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:16Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary fructosuria

Pathogenic:10Other:1

Likely pathogenic, criteria provided, single submitter	literature only	Counsyl	Jul 02, 2014	- -
Pathogenic, no assertion criteria provided	literature only	ATS em Genética Clínica, Universidade Federal do Rio Grande do Sul	Mar 18, 2021	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jan 14, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 01, 1990	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Feb 04, 2022	- -
Pathogenic, no assertion criteria provided	clinical testing	HFI Laboratory at Boston University, Boston University	-	- -
not provided, no classification provided	literature only	GeneReviews	-	One of the six most common HFI variants in US and European populations including Turkey, Spain, Central Europe, France, US, and Italy -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 20, 2018	Variant summary: ALDOB c.360_363delCAAA (p.Asn120LysfsX32) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 4.7e-05 in 277096 control chromosomes. This frequency is not higher than expected for a pathogenic variant in ALDOB causing Hereditary Fructose Intolerance (4.7e-05 vs 0.0045), allowing no conclusion about variant significance. The c.360_363delCAAA variant has been reported in the literature in multiple individuals affected with Hereditary Fructose Intolerance, both as a homozygous and compound heterozygous allele. These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 02, 2024	This sequence change creates a premature translational stop signal (p.Asn120Lysfs*32) in the ALDOB gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ALDOB are known to be pathogenic (PMID: 18541450). This variant is present in population databases (rs762198323, gnomAD 0.02%). This premature translational stop signal has been observed in individuals with fructose intolerance (PMID: 2339710, 26937407). ClinVar contains an entry for this variant (Variation ID: 188861). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 18, 2024	- -

not provided

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2024	ALDOB: PVS1, PM3:Strong, PM2 -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 09, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 30, 2023	Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 34524712, 31980526, 33028743, 31589614, 34426522, 34162028, 15880727, 16406649, 23430936, 22975760, 2339710, 30202406, 26937407) -
Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Dec 01, 2021	PM2, PVS1 -

Inborn genetic diseases

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2022

The c.360_363delCAAA (p.N120Kfs*32) alteration, located in exon 4 (coding exon 3) of the ALDOB gene, consists of a deletion of 4 nucleotides from position 360 to 363, causing a translational frameshift with a predicted alternate stop codon after 32 amino acids. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. Based on data from gnomAD, this alteration has an overall frequency of <0.01% (14/282762) total alleles studied. The highest observed frequency was 0.02% (3/19954) of East Asian alleles. This alteration has been reported in multiple unrelated patients with hereditary fructose intolerance (Dazzo, 1990; Valadares, 2015; Kim, 2021). Based on the available evidence, this alteration is classified as pathogenic. -

ALDOB-related disorder

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 26, 2024

The ALDOB c.360_363delCAAA variant is predicted to result in a frameshift and premature protein termination (p.Asn120Lysfs*32). This variant has been observed in the homozygous and compound heterozygous states in patients with hereditary fructose intolerance (described as Δ4 in Dazzo and Tolan. 1990. PubMed ID: 2339710; Alfares. 2018. PubMed ID: 30202406; Valadares et al. 2015. PubMed ID: 26937407). This variant is reported in 0.015% of alleles in individuals of East Asian descent in gnomAD. Frameshift variants in ALDOB are expected to be pathogenic. In summary, this variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over